DatasetError: Operation (onReady) is not allowed because the field used to build this page's URL is empty

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I having this error (as I mention on my title post) with my dynamicDataset whereby I want to pass random data to dynamic page to display more detail about testimony stories.

Here I attach my $w.onReady() snippet

$w.onReady(() => {
    $w("#dynamicDataset").onReady(async function () {
        //Total testimony
        wixData.query("Testimonial")
            .count()
            .then((results) => {
                let counterTestimoni = results.toString();
                $w("#totalCountTxt").text = String(counterTestimoni + " interesting stories");
            })

        //random featured story
        randomStory();

        //shuffle repeater
        let data = $w("#testimonialRepeater").data;
        data = shuffle(data);
        $w("#testimonialRepeater").data = data;

        //Load testimony
        loadPrograms();
        $w('#testimonialRepeater').show("float", floatInOptions);
    });
});

And below is my snippet code for randomStory();

//random featured story
export function randomStory() {
    wixData.query("Testimonial")
        .find()
        .then((results) => {
            let randomNumber = Math.floor((Math.random() * results.items.length));
            let randomItem = results.items[randomNumber];

            $w("#text29").text = randomItem.tesName;
            $w("#text30").text = randomItem.product;
            $w("#image6").src = randomItem.tesProfilePic;
            $w("#text31").text = randomItem.tesDescription;
            if ($w("#text31").text.length > 100) {
                $w("#text31").text = randomItem.tesDescription.substr(0, 100) + "...";
            }
            $w('#button2').link = "/testimonial-1/randomItem.tesName";
        });
}

I hope anyone could help me what am I missing or what mistake did I do with my code.